Roller for round-picking grindstones, emery-wheels, &amp; c.



Patented Feb. l3, I900.

C. A. V. HALL GREN. ROLLER FOR BOUND PICKING GRINDSTUNES, EMERY WHEELS, 81.0.

(Application filed Apr. 22, 1899.\

2 Sheets-Shee1 I.

(No Model.)

INVENTOH W/TNESSES:

flay/9mg ATTORNEYS,

"m: cams PUERS co, Pno'rauwo" WASHINGTON, a. c

No. 643,l28. Patentad Feb. I3, 1900.

C. AQV. HALLGREN. ROLLER FOR ROUND PIGKING GRINDSTDNES, EMERY-WHEELS, 81.0.

(Application filed Apr. 22, 1899.] (No Model.)

2 Sheets-Sheet 2.

W/TNESSES. INVENTOH ATTORNEYS m: Ncmus PETERS ca, Pnowmjma, WASHKNGYON, n. c,

larly on the latter.

rrn STATES PATENT QFFICE.

CARL ANDREAS VIKTOR HALLGREN, OF STOCKI-IOLM, SlVEDEN.

ROLLER FOR ROUND-PICKING GRINDSTONES, EMERY-WHEELS, dc.

SPECIFICATION forming part of Letters Patent No. 643,128, dated February 13, 1900.

Application filed April 22, 1899.

To (all whom it may concern:

Be it known that I, CARL ANDREAS VIKTOR I-IALLGREN, foreman, a subject of the King of Sweden and Norway, and a resident of Gretmagnigatan 9, Stockholm, Sweden, have invented certain new and useful Improvements in Rollers for Round-Picking of Grindstones, Emery-Wheels, and the Like or forWorking IIard Surfaces in General, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a roller for the round-picking of grindstones, emery-wheels, and the like or for working hard surfaces in general. It is composed of a number of small hard'steel rods radiating from the roller-shaft and bearing with their inner ends perpendicu- By the aid of suitable intermediate collars the rods are held together on the said shaft between a shoulder on the latter and some form of clamping-nut. The thickness of metal of the rods is but slight; but owing to their having a curved or corrugated cross-section the rods can without bending penetrate into the stone or surface with their free ends and without requiring at any time to be ground. The roller revolves freely in a suitable holder, being driven by the rotating stone or emery-wheel or the surface in motion, in contact with which it is held, its action being based on the aforesaid penetrative power of the rods. The work performed consequently consists in a rapid picking, the more intense as the diameter of the roller is small in comparison with the grindstone or emery-wheel and its velocity of rotation consequently quite great.

Figure 1 shows a section axially through the roller, and Fig. 2 an end view of same, partially in section. Figs. 3 and 4 show a moditied arrangement of the roller, and Figs. 5, 6, and '7 the holder.

The small steel rods are designated by a and the shaft by b. The latter, which is tubular in order that the roller maybe slid onto the pin g of the holder, Fig. 6, has a head I),

between which and the clamping-nuts f is clamped the collection of rods and distancecollars, the latter alternately consisting of plate metal and some soft material-for instance, pasteboard or leather. In putting the Serial No. 714,075. (No model.)

tool together the shaft b is placed upright and a plate washer c is slid over it, a layer of rods a being subsequently placed on the latter. Then a paper disk d and a plate collar 0 is put on and on the latter a fresh layer of rods, and so on. The whole is clamped together by means of the nuts f. The inner slightly-compressed ends of the rods are made to bear against the shaft of the roller, and the rods are so placed that the side having sharp edges, owing to the corrugated or U-shaped cross-section of the rod, will face the pasteboard disk d. When the pieces are clamped together, the said edges enter into the pasteboard disk, and the whole is consequently fastened securely together. Only about half the length of the rods is embraced by the intermediate collars or distance-pieces, their free outer ends being enabled to enter in the piece operated on until the roller has worn off close to the said collars. The wear is insignificant, however, owing to the comparatively great length of the cutting edge, due to the curved or corrugated cross-section of the rod. Evidently this may differ from that shown in the drawings, being instead made W or S shaped, for instance.

The modified arrangement, Figs. 3 and 4, consists in that the rods are wound with wire, which may be necessary when they are straight in cross-section1l. 6., when the latter is not curved or corrugated. The wind ing is done in the manner that each respective layer of rods is provided with a wire g, passing zigzag around the rods and coiled about the roller, so that only the outer ends of the rods are left free. In this manner each layer of rods forms a coherent disk, Fig. 4. This disk is dipped in melting tin or the like even with the inner edge of the winding, so that the wire coils and the rods become soldered together. Several disks are subsequently slid onto the shaft, alternating with distance pieces, and clamped together by means of the nuts, Fig. 3. The roller is used until the rods have Worn down to the winding, a portion of the latter being afterward unraveled, as required. The Winding may also be produced by passing the wire 9 back and forth along the axis of the roller around the rows of rods.

The roller is inserted in the fork h of the holder, Figs. 5 to 7, being allowed to revolve freely on the pin 9' of said fork. The holder, moreover, consists of the support t', carrying the fork h, the sleeve 70, which can be moved along the frame Z by means of the screw n,

and the screw m, belonging to the support and surrounded by the sleeve 70, and with which screw engages the nut 10, which is rotatably attached to the sleeve and serves for moving the roller-support backward or forward at right angles to the frame Z. The fork It has a pivot-pin r passing up through the support tand provided with a tightening-nut s. The holder is attached in such a manner to the grindstone or emery-wheel frame that the roller can be moved in contact With the stone or wheel, (ndioated by the are 1).) If it is desired to turn off the edge of the stone or wheel, the roller is adjusted accordingly by turning the fork on the pin 0.

Having now described my invention, what I claim as new, and desire to secure by Letters.

Patent, is'

1. A cutter or dressing-tool consisting of a series of rings each comprising a plurality of radially-arranged rods with means for bold ing said rods together with their outer ends spaced apart, the said rods being of channel cross-section form, said radial rods being independent of each other, substantially as described.

2. A cutter or dressing-tool consisting of a shaft, a series of rings each comprisinga plurality of independent channeled rods, means for holding the rods of each ring together, and means for clamping the several rings to each other and upon said shaft, substantially as described.

3. In combination, the series of rods radially arranged with spaees between them,wires intertwined with said rods for holding them together, the shaft 1) for holding the rods and means for holding the rods on said shaft, sub stantially as described.

4. In combination, the shaft, the series of rods radially arranged with spaces between them and wires intertwined with said rods for holding them together, said wires and rods being soldered together and means for clamping the rods on said shaft, substantially as described.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

CARL ANDREAS VIK'IOR HALLGREN.

Witnesses:

HANS B. OHEssoN, J. F. A. RUTBACK.

Correction in Letters Patent No. 643,128.

It is hereby certified that the name of the patentee in Letters Patent No. 643,128, granted February 13, 1900, for an improvement in Rollers for Round-Picking Grindstones, Emery-Wheels, 810., was erroneously written and printed Carl Andreas Viktor Hallgren, whereas said name should have been written and printed Carl Andreas V'Uctor Hdllgren; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed, countersigned, and sealed this 24th day of April, A. D., 1900.

[SEAL] THOS. RYAN,

First Assistant Secretary of the Interior. Oountersigned G. H. DUELL,

Commissioner of Patents. 

